3-morpholin-4-yl-1-phenyl-propan-1-one, 3-methyl-4-morpholin-4-yl-butan-2-one and 1- morpholin-4-yl-pentan-3-one as anti corrosion agents have been synthesized first time by Mannich reaction from morpholin hydrocloride, formalin, methyl phenyl ketone and ethyl methyl ketone. The structure of the products have been determined by spectroscopic means.